When the Martian axis tilt is small, the Martian poles
A) expand and remain permanently frozen, thinning the atmosphere
B) contract and partially vaporize, thickening the atmosphere
C) extend over the entire surface of the planet
D) completely disappear
A
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Most spiral galaxies have rotation curves that
A) decrease rapidly with increasing radius in the disk, indicating no dark matter is present. B) increase drastically with increasing radius. C) decrease rapidly with increasing radius in the disk, indicating the presence of dark matter. D) stay constant out to large radii in the disk, indicating that no dark matter is present. E) stay constant out to large radii in the disk, indicating the presence of dark matter.
How large are granules, and how long do they last?
What will be an ideal response?
A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
a. 43 m/s b. 47 m/s c. 39 m/s d. 36 m/s e. 14 m/s
The graphs below show angular velocity as a function of time. In which one is the magnitude of the angular acceleration constantly decreasing?
a.
b.
